Adjustable Trigger? Don't Think So

This is a spin-off of another thread of mine. I found the tool to chance the Pull Weight on my Ruger m77 (a very tiny Star-Head), but it didn't change ANYTHING! Even after I removed the screw completely, the trigger pull was still over 5 pounds. How can this be :banghead:?

Do I have any options besides a trip to the Smith? Would a lighter trigger spring solve anything?